Material Specification for Hg:1223; [Hg-Ba-Ca-Cu-O]
Process: Solid State Reaction
Notes: "Samples were pepared, using the controlled vapour-solid reaction technique by heating a precursor pellet of Ba2Ca2Cu3Ox and a composite Hg source together in an evacuated quartz tube. The precursor pellets were prepared by heating and drying an aqueous solution of appropriate amounts of Ba(NO3)2, Ca(NO3)2·4H2O and Cu(NO3)2·3H2O up to 620 °C in a beaker. The resulting black mixture was then ground, compacted and sintered in flowing oxygen at 900 °C for 24 h to 48 h in an alumina crucible. ... Some of the pellets were pulverized, thoroughly mixed with HgO and compacted (in a glove bag) to form the composite Hg source (prereacted HgBa2Ca2Cu3Ox). A small precursor pellet and a large compsite Hg source (in a ratio of about 1/3) were sealed in an evacuated quartz tube, heated to 850 °C and kept at this temperature for 5 h before cooling to room temperature. The Hg-1223 pellets were finally heated at 300 °C in flowing oxygen for 10 h. X-ray diffraction revealed that about 90% of a pellet was Hg-1223 and the remaining approximately 10% was a mixture of CaHgO2, Ba2Cu3O5.9 and BaCuO2, Both orthorhombic and tetragonal Hg-1223, with a similar Tc, were obtained."
Formula: HgBa2Ca2Cu3O8+x
Informal Name: Hg:1223
Chemical Family: Hg-Ba-Ca-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Critical Temperature for Hg:1223; [Hg-Ba-Ca-Cu-O]
| Pressure (GPa) |
Tc (K) |
Critical Temperature (K) |
| 1.1 |
138 |
134 |
| 2.0 |
142 |
136 |
| 3.0 |
145 |
139 |
| 4.0 |
146 |
141 |
| 5.0 |
148 |
140 |
| 6.0 |
150 |
142 |
| 7.0 |
151 |
145 |
| 8.0 |
151 |
145 |
| 10.0 |
153 |
146 |
| 12.5 |
153 |
146 |
| 14.9 |
152 |
147 |
Measurement Method: Four-probe resistance
"Samples of about 4 mm x 0.8 mm x 0.7 mm were cut from a well-characterized pellet for measurements up to about (1.7 GPa = 17 kbar) under hydrostatic pressure (HP); other samples, about 0.9 mm diameter x 0.08 mm thick, were prepared for measurements up to about (15 GPa = 150 kbar) under quasi-hydrostatic pressure (QHP). The HP was generated inside a Teflon cup housed in a Be-Cu clamp using 3M Fluorinert as the pressure medium. The pressure was determined by a superconducting Pb manometer situated next to the sample. The QHP environment was provided by a pair of tungsten carbide anvils locked in a Be-Cu clamp using pyrophyllite as a gasket and two steatite disks as a pressure medium. The pressure was calibrated against the various phase transitions of bismuth at room temperature and the superconducting Pb manometer at low temperatures in separate calibration runs, and was not measured in situ during the experimental runs. The overall uncertainty in QHP is estimated to be ±15%. ... The superconducting transition of Hg-1223 under pressure was determined electrically by the four-probe technique. The temperature was measured by a germanium thermometer below 30 K and a chromel-alumel thermocouple above 20 K, with an uncertainty of ±0.1 K." No additional measurement details were noted.
Cautions: Evaluated Data
Tc
is tabulated as the critical temperature.
Digitized data were obtained from Figure 4 of the paper.
Resistivity (normal state) for Hg:1223; [Hg-Ba-Ca-Cu-O]
| Temperature (K) |
Resistivity (normal state) (mΩ·cm) |
| 110 |
0 |
| 134 |
0 |
| 134 |
1.9 |
| 134 |
5.5 |
| 135 |
6.7 |
| 139 |
8.7 |
| 147 |
10.5 |
| 155 |
11.7 |
| 163 |
13.0 |
| 176 |
14.8 |
| 186 |
16.2 |
| 196 |
17.6 |
| 208 |
18.7 |
| 218 |
19.9 |
| 229 |
20.9 |
| 241 |
22.3 |
| 251 |
23.4 |
| 264 |
24.4 |
| 277 |
25.6 |
| 291 |
27.0 |
Measurement Method: Four-probe resistance
"Samples of about 4 mm x 0.8 mm x 0.7 mm were cut from a well-characterized pellet for measurements up to about (1.7 GPa = 17 kbar) under hydrostatic pressure (HP); other samples, about 0.9 mm diameter x 0.08 mm thick, were prepared for measurements up to about (15 GPa = 150 kbar) under quasi-hydrostatic pressure (QHP). The HP was generated inside a Teflon cup housed in a Be-Cu clamp using 3M Fluorinert as the pressure medium. The pressure was determined by a superconducting Pb manometer situated next to the sample. The QHP environment was provided by a pair of tungsten carbide anvils locked in a Be-Cu clamp using pyrophyllite as a gasket and two steatite disks as a pressure medium. The pressure was calibrated against the various phase transitions of bismuth at room temperature and the superconducting Pb manometer at low temperatures in separate calibration runs, and was not measured in situ during the experimental runs. The overall uncertainty in QHP is estimated to be ±15%. ... The superconducting transition of Hg-1223 under pressure was determined electrically by the four-probe technique. The temperature was measured by a germanium thermometer below 30 K and a chromel-alumel thermocouple above 20 K, with an uncertainty of ±0.1 K." No additional measurement details were noted.
Cautions: Evaluated Data
Digitized data were obtained from Figure 1 of the paper.
Magnetic Susceptibility for Hg:1223; [Hg-Ba-Ca-Cu-O]
| Cooling Condition () |
Temperature (K) |
Magnetic Susceptibility (arbitrary) |
| ZFC |
120 |
-4.4 |
| ZFC |
125 |
-4.1 |
| ZFC |
129 |
-3.6 |
| ZFC |
131 |
-3.2 |
| ZFC |
132 |
-2.7 |
| ZFC |
133 |
-2.1 |
| ZFC |
134 |
-0.5 |
| ZFC |
134 |
-0.4 |
| ZFC |
135 |
0 |
| ZFC |
137 |
0 |
| ZFC |
140 |
0 |
| FC |
121 |
-0.7 |
| FC |
124 |
-0.7 |
| FC |
127 |
-0.7 |
| FC |
129 |
-0.6 |
| FC |
132 |
-0.5 |
| FC |
134 |
-0.4 |
| FC |
135 |
0 |
Measurement Method: DC susceptibility
No measurement details were noted.
Cautions: Unevaluated Data
Digitized data were obtained from Figure 1 (inset) of the paper.
